diff --git a/python/tests/unit/test_config.py b/python/tests/unit/test_config.py
index 3c278d5..a0fc4ad 100644
--- a/python/tests/unit/test_config.py
+++ b/python/tests/unit/test_config.py
@@ -171,6 +171,23 @@ class TestPluginShimming:
         config = self._parse_yaml(tmp_path, plugins={"glightbox": {}})
         assert GlightboxExtension.name in config["markdown_extensions"]
 
+    def test_mike_plugin_defaults_with_versioned_build(
+        self, monkeypatch: pytest.MonkeyPatch, tmp_path: Path
+    ) -> None:
+        monkeypatch.setenv("MIKE_DOCS_VERSION", "0.3")
+        config = self._parse_yaml(
+            tmp_path,
+            site_url="https://example.com",
+            plugins=["mike"],
+        )
+        assert config["site_url"] == "https://example.com/0.3"
+        assert config["plugins"]["mike"]["config"] == {
+            "alias_type": "symlink",
+            "redirect_template": None,
+            "deploy_prefix": "",
+            "canonical_version": None,
+        }
+
     def test_glightbox_adds_extension_and_forwards_config(
         self, tmp_path: Path
     ) -> None:
diff --git a/python/zensical/config.py b/python/zensical/config.py
index 2096ddd..b816f4b 100644
--- a/python/zensical/config.py
+++ b/python/zensical/config.py
@@ -1286,17 +1286,11 @@ def _convert_plugins(value: Any, config: dict) -> dict:
     # building the site, while only allowing for our theme at the moment.
     version = os.environ.get("MIKE_DOCS_VERSION")
     if version and config.get("site_url"):
-        mike = set_default(
-            plugins,
-            "mike",
-            {
-                "alias_type": "symlink",
-                "redirect_template": None,
-                "deploy_prefix": "",
-                "canonical_version": None,
-            },
-            dict,
-        )
+        mike = set_default(plugins, "mike", {}, dict)
+        set_default(mike, "alias_type", "symlink", str)
+        set_default(mike, "redirect_template", None)
+        set_default(mike, "deploy_prefix", "", str)
+        set_default(mike, "canonical_version", None)
 
         # Copied and adapted from mike's plugin implementation
         if mike["canonical_version"] is not None: